Vehicle safety device for engine shut-off and emergency assistance

ABSTRACT

A vehicle safety device for detecting vehicle tilt automatically shuts-off power to an ignition system and fuel pump and summons emergency assistance using a bistable switch circuit that toggles between a first bistable switch position in response to a reset signal and a second bistable switch position in response to an alert signal. The safety device can remain in the bistable switch positions without a power source and employ an encrypted bi-directional protocol to summon emergency assistance and generate the reset signal without vehicle operator intervention.

CROSS REFERENCE

This application is a continuation and claims benefit of U.S. patent application Ser. No. 16/746,474 filed Jan. 17, 2020, which is a continuation-in-part and claims benefit of U.S. patent application Ser. No. 15/872,829 filed Jan. 16, 2018 (now U.S. Pat. No 10,539,084), which is a continuation-in-part and claims benefit of U.S. patent application Ser. No. 14/944,818 filed Nov. 18, 2015 (now U.S. Pat. No 9,869,286), which is a non-provisional and claims benefit of U.S. Provisional Application No. 62/081,127, filed Nov. 18, 2014, the specification(s) of which is/are incorporated herein in their entirety by reference.

Also, U.S. patent application Ser. No. 15/872,829 is a non-provisional and claims benefit of U.S. Provisional Patent Application No. 62/516,351 filed Jun. 7, 2017, the specification(s) of which is/are incorporated herein in their entirety by reference.

Also, U.S. patent application Ser. No. 16/746,474 is a non-provisional and claims benefit of U.S. Provisional Application No. 62/961,060 filed Jan. 14, 2020, the specification(s) of which is/are incorporated herein in its entirety by reference.

Further, U.S. patent application Ser. No. 16/746,474 is a continuation-in-part and claims benefit of PCT/US19/13767 filed Jan. 16, 2019, which is a continuation-in-part and claims benefit of U.S. patent application Ser. No. 15/872,829 filed Jan. 16, 2018, the specification(s) of which is/are incorporated herein in their entirety by reference.

FIELD OF THE INVENTION

The present invention relates to automobile safety, namely, a safety device that detects when a vehicle rolls or flips over, shuts off the engine and generates a notification signal to summon emergency assistance.

BACKGROUND OF THE INVENTION

Rollover crashes are one of the most significant safety problems for all classes of light vehicles especially light trucks (pickups, sport utility vehicles, and vans—LTVs). For 1992 through 1996, there was an average of approximately 227,000 rollover crashes per year. (Rollover crashes are ones in which rollover is the first harmful event.) These rollovers resulted in an average of 9,063 fatalities per year (29 percent of all light vehicle fatalities) and over 200,000 non-fatal injuries per year. In terms of fatalities per registered vehicle, rollovers are second only to frontal crashes in their level of severity. The rollover problem is more serious for light trucks, especially sport utility vehicles. State crash data indicates that, for all types of collisions, LTVs are in 68 percent as many crashes per registered vehicle as are passenger cars.

A major problem in rollover accidents is the release of fuel, which can trigger a fire and greatly increase the injury and fatality rate in rollover accidents. Thus, a goal of vehicle safety is to disable the fuel pump and engine when a rollover occurs as well as electrical sources of ignition such as the starter and electrical system. Disabling the starter and electrical system reduces the chances of igniting a fire if fuel escapes.

In the US alone and at the start of 2014, there exist approximately 241 million registered passenger vehicles without rollover safety. In 2014, it is expected that an additional 16 to 17 million more will be added to the tally. The present invention describes a vehicle safety device effective for providing rollover safety as well as emergency assistance to all vehicles having an electric fuel pump.

Any feature or combination of features described herein are included within the scope of the present invention provided that the features included in any such combination are not mutually inconsistent as will be apparent from the context, this specification, and the knowledge of one of ordinary skill in the art. Additional advantages and aspects of the present invention are apparent in the following detailed description and claims.

SUMMARY OF THE INVENTION

A vehicle safety device automatically shuts off both the engine and electric fuel pump and summons emergency assistance the instant a vehicle rolls or flips over a critical angle. The angle used to determine excessive tilt, or inclination, tends to vary by vehicle application. For instance, box shaped vehicles typically tip on their sides but rarely continue to roll over. The safety device can be configured to trigger at a desired angle of inclination depending on the vehicle type. The safety device is designed to be resettable with manufacturer support after such an accident. Once set due to a rollover, the safety device remains set, independent of vehicle power, until reset by a trained technician or other authorized service.

By shutting off power to the ignition system and fuel pump, and shutting off the engine, the safety device can reduce fires and explosions resulting from severe rollover accidents. In addition to saving lives, by reducing the hazards of rollover accidents, liability claims from rollover accidents can be reduced.

The safety device is relatively simple and cost-effective to construct, and does not require power to keep the engine and fuel pump inoperative.

In one embodiment, the safety device includes a bistable switch circuit that toggles between a first bistable switch position to shut-off the engine and summon emergency assistance in response to an alert signal and a second bistable switch position to resume normal engine operation in response to a reset signal. Preferably, the safety device remains in the bistable switch positions without a power source and employs a microprocessor-based encrypted bi-directional protocol for RF communication with remote sources to summon emergency assistance and generate the reset signal independently of the vehicle operator.

In some embodiments, the bistable switch circuit includes electro-mechanical latching relay switches to shut-off the engine and generate a notification signal. In other embodiments, the bistable switch circuit includes solid state relay switches to shut-off the engine and generate the notification signal. In still other embodiments, the bistable switch circuit includes an electro-mechanical relay switch to shut-off the engine and a solid state relay switch, logic switch, flip-flop and/or amplifier to generate the notification signal. The bistable switch circuit can remain in either bistable switch state indefinitely and move to the other stable state when appropriately triggered.

According to one embodiment, the safety device upon detection of vehicle tilt automatically shuts-off power to the ignition system, electrical system and fuel pump of the vehicle. For instance, the safety device can shut-off power to the ignition relay and ignition starter of the ignition system. In some embodiments, the safety device comprises a power input, a ground input, a first latching relay switch, and a second latching relay switch. The ground input may be operatively connected to a vehicle common ground.

In other embodiments, the first and second latching relay switches each comprise: an input, a first output position, a second output position, a set pin, and a reset pin, which is also connected to the ground input. The first output position is the initial position of each latching relay switch. When power is supplied to the set pin, the respective latching relay switch switches to the second output position.

In further embodiments, the safety device additionally comprises an ignition start input, an ignition start output, and an electrical shut-off signal. The ignition start input may be operatively connected to the input of the first latching relay switch, while the ignition start output may be operatively connected to the first output position of the first latching relay switch. Further, the electrical shut-off signal may be operatively connected to the second output position of the second latching relay switch, where the input of the second latching relay switch may be operatively connected to the power input.

In still further embodiments, upon application of battery power to each set pin, the first and second latching relay switches switch from the first output position to the second output position, thus disconnecting power to the ignition system and the fuel pump. Moreover, power flows to the electrical shutoff signal, via the second latching relay switch, thereby generating the notification signal to summon emergency assistance and, if desired, causing the electrical system of the vehicle to shut down.

In additional embodiments, the safety device employs a circular or elliptical arc level sensor to detect an inclination of the vehicle. In some embodiments, the arc level sensor comprises an arcuate tube partially filled with a liquid. An air bubble is disposed in the arcuate tube such that the liquid and the air bubble fill the arcuate tube. The air bubble rests at an apex of the arcuate tube when an inclination of the arc level sensor is zero. In other embodiments, the arc level sensor comprises a first and second light emitting element disposed on the exterior of the arcuate tube and a first and second photodetector disposed on the exterior of the arcuate tube opposite the first and second light emitting elements respectively.

These and other objects, features and advantages of the present invention will be further described and more readily apparent from the detailed description and claims which follow.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a relay control schematic of an embodiment of the present invention comprising four relay switches.

FIG. 2 shows a diagrammatic representation of a circular arc level (CAL) used as a sensor in the present invention.

FIG. 3 shows a simplified relay control schematic of an embodiment of the present invention comprising three relay switches.

FIG. 4 shows a bird's eye view of a vehicle roll-over.

FIG. 5 shows an exploded view of the mechanical implementation of an embodiment of the present invention.

FIGS. 6A-6B show example embodiments of photo optic schematics that drive the photo optic components of the present invention.

FIG. 7 shows a simplified microprocessor control schematic of an embodiment of the present invention comprising operational features and details.

DESCRIPTION OF PREFERRED EMBODIMENTS

Following is a list of elements corresponding to a particular element referred to herein:

101 third latching relay switch

102 fourth latching relay switch

103 first latching relay switch

104 alternator power

105 ground input

108 battery power

110 first and second ignition switch motor-on inputs

111 ignition start input

112 electrical shut-off signal

113 first ignition switch motor-on output

114 second ignition switch motor-on output

115 ignition start output

117 second latching relay switch

119-127 DIP switch positions

133 transistor

200 circular arc level sensor

201 arcuate tube

203 air bubble

205 first light emitting element

207 second light emitting element

209 first photodetector

211 second photodetector

502 screws

504 flange lid

506 photodetectors

508 light emitting elements

510 CAL sensor

512 photo optic circuit board

514 relay control board, circuit board

516 fuel pump control relay

517 Ignition control relays

518 wires

520 insulator

522 housing

1006 dual comparator

1007 single comparator

1008 Logical OR Gate

Referring to FIGS. 1-7, a vehicle safety device comprises a custom sensor and circuit to detect vehicle rollover where, upon detection, the safety device shuts off power to the fuel pump, starter, and engine. In some embodiments, the safety device comprises a power input, a ground input (105), a first latching relay switch (103), and a second latching relay switch. The ground input (105) is operatively connected to a vehicle common ground.

In other embodiments, the first (103) and second (117) latching relay switches each comprise: an input, a first output position, a second output position, a set pin, and a reset pin, which is also connected to the ground input (105). The first output position is the initial position of each latching relay switch. When power is supplied to the set pin, the respective latching relay switch switches to the second output position.

In further embodiments, the safety device additionally comprises an ignition start input (111), an ignition start output (115), and an electrical shut-off signal (112). The ignition start input (111) may be operatively connected to the input of the first latching relay switch (103), while the ignition start output (115) may be operatively connected to the first output position of the first latching relay switch (103). Further, the electrical shut-off signal (112) may be operatively connected to the second output position of the second latching relay switch (117), where the input of the second latching relay switch (117) may be operatively connected to the power input.

In additional embodiments, the safety device employs a circular arc level (200), herein referred to as a CAL sensor, to detect an inclination of the vehicle. In other embodiments, the CAL sensor comprises an arcuate tube (201) partially filled with a liquid. An air bubble (203) is disposed in the arcuate tube (201) such that the liquid and the air bubble (203) fill the arcuate tube (201). In an embodiment, the air bubble (203) rests at an apex of the arcuate tube (201) when an inclination of the CAL sensor (200) is zero.

Returning to FIG. 2, in some embodiments, the CAL sensor (200) also comprises a first (205) and second (207) light emitting element each disposed on the exterior of the arcuate tube (201). In other embodiments, the first light emitting element (205) is disposed at a first location about 75°-90° from the apex of the arcuate tube (201) and emits a first optical signal. The second light emitting element (207) is disposed at a second location about 270°-285° from the apex of the arcuate tube (201) and emits a second optical signal. In supplementary embodiments, the CAL sensor (200) may further comprise a first (209) and second (211) photodetector each disposed on the exterior of the arcuate tube (201). The first photodetector (209) is disposed at a third location about 75°-90° from the apex of the arcuate tube (201), where the third location is opposite the first location such that the arcuate tube (201) is disposed between the first light emitting element (205) and the first photodetector (209). The first photodetector (209) is positioned to detect the first optical signal when the air bubble (203) disposed in the arcuate tube (201) is positioned between them, as the arcuate tube (201) is transparent (or substantially transparent) at least between the first photodetector (209) and the first light emitting element (205). Additionally, the second photodetector (211) is disposed at a fourth location about 270°-285° from the apex of the arcuate tube (201), where the fourth location is opposite the second location such that the arcuate tube (201) is disposed between the second light emitting element (207) and the second photodetector (211). In preferred embodiments, the second photodetector (211) is positioned to detect the second optical signal when the air bubble (203) disposed within the arcuate tube (201) is positioned between them, as the arcuate tube (201) is transparent (or substantially transparent) at least between the second photodetector (211) and the second light emitting element (207).

In one non-limiting example embodiment, the first light emitting element (205) is disposed at the first location about 80° from the apex of the arcuate tube (201) and the first photodetector (209) is positioned opposite the first emitting element (205), at 80° from the apex of the arcuate tube (201). In such an example, the second light emitting element (207) is disposed at the second location 280° from the apex of the arcuate tube (201) and the second photodetector (211) is positioned opposite the second light emitting element (207), at 280° from the apex of the arcuate tube (201). As such, the positions of the first light emitting element and the first photodetector may be interchanged without deviating from the scope of the invention. Likewise, the positions of the second light emitting element and the second photodetector may be interchanged without deviating from the scope of the invention. Non-limiting examples of light emitting elements are light emitting diodes (“LEDs”).

The liquid disposed in the arcuate tube (201) is selected to prohibit detection of the first and second optical signals by the first (209) and second (211) photodetectors, respectively. For example, the liquid may be black to absorb all visible light signals emitted by the light emitting elements. As another example, the liquid may be green or yellow to block a red light signal. As can be understood by one of ordinary skill in the art, many such combinations exist.

In supplementary embodiments, a conductive pin, a transistor (133), and a normally open switch additionally comprise the safety device. The conductive pin may be operatively connected to the battery power. The transistor (133) may comprise a base pin, a collector pin, and an emitter pin. In an embodiment, the collector pin is connected to the alternator power (104) while the emitter pin is connected to all four latching relay switches (103), (117), (102), and (101). In another embodiment, the base pin is connected to the conductive pin via the switch. The switch is operatively coupled to the first and second photodetector (211) such that a first signal sent from the first photodetector (209) or a second signal sent from the second photodetector (211) activates the switch to close.

Consistent with previous embodiments, the CAL sensor (200) is fixed to the body of the vehicle. When the CAL sensor (200) is in an upright position relative to gravity, the air bubble (203) rests at an initial position at the apex of the arcuate tube (201) and the liquid is blocking detection of the first optical signal and the second optical signal. In one example embodiment, at an inclination of the CAL sensor (200) within a first threshold window, centered at about 75°-90° from the apex of the arcuate tube (201), the air bubble (203) travels from the initial position to rest between the first photodetector (209) and the first light emitting element (205) thus activating the CAL sensor by permitting detection of the first optical signal. Upon detection of the first optical signal, the first photodetector (209) transmits a first signal that activates the switch to close. In this way, a closed circuit is formed to allow current to flow through the conductive pin to the base pin, which opens an electrical path from the battery power to each set pin.

Additionally, at an inclination of the CAL sensor (200) within a second threshold window, centered at about 270°-285° from the apex of the arcuate tube (201), for example, the air bubble (203) travels from the initial position to rest between the second photodetector (211) and second light emitting element (207) thus activating the CAL sensor (200) by permitting detection of the second optical signal. Upon detection of the second optical signal, the second photodetector (211) transmits a second signal that activates the switch to close. In this way, a closed circuit is formed to allow current to flow through the conductive pin to the base pin, which opens an electrical path from the battery power to each set pin.

The CAL sensor (200) measures gravitational norm deviation while remaining impervious to the effects of acceleration, deceleration, impact and centripetal forces. It measures the angles an object is off from the vector of direct gravitational pull. More specifically, the CAL sensor (200) measures exact tilt, or inclination. In combination with a microprocessor, the change in inclination of an object with respect to time may be acquired. When used in perpendicularly oriented pairs, the CAL sensor (200) may be used to measure both roll and flip of a vehicle. The CAL sensor (200) offers a solid state solution to tilt detection since its only moving part is a frictionless bubble.

Further details regarding tilt sensors are set forth in U.S. patent application Ser. No. 15/872,829, filed Jan. 16, 2018, the specification of which is incorporated herein in its entirety by reference.

At an application of power (e.g. battery power) to each set pin, the first (103) and second (117) latching relay switches switch from the first output position to the second output position, thus disconnecting power to the ignition starter. Moreover, power then flows to the electrical shutoff signal (112), via the second latching relay switch (117), notifying need for the electrical system of the vehicle to shut down.

In an alternate embodiment, the safety device further comprises a third latching relay switch (101) and a fourth latching relay switch (102) each comprising: an input, a first output position, a second output position, a set pin, and a reset pin, which is also connected to the ground input (105). The first output position is the initial position of each latching relay switch. When power is supplied to the set pin, the respective latching relay switch switches to the second output position. In some embodiments, a first ignition switch motor-on input (110) is operatively connected to the input of the third latching relay switch (101), and a second ignition switch motor-on input (110) is operatively connected to the input of the fourth latching relay switch (102). Further, a first ignition switch motor-on output (113) may be operatively connected to the first output of the third latching relay switch (101), and a second ignition switch motor-on output (114) may be operatively connected to the first output of the fourth latching relay switch (102).

Initially, the alternator power (104) flows through the third (101) and fourth (102) latching relay switch to the first (110) and the second (110) ignition switch motor-on input. When the CAL sensor (200) is activated, power flows from the power input to the set pins of the first (103), the second (117), the third (101), and the fourth (102) latching relay switches, causing each relay switch to switch from the first output position to the second output position. In this way, power to the first ignition switch motor-on input (110), the second ignition switch motor-on input (110), and the ignition starter is disconnected. Moreover, power flows to the electrical shutoff signal (112), thereby causing: notification for the electrical system of the vehicle to shut down, a notifying of an overseeing computer, and/or summoning of an emergency response. In an alternative embodiment, ignition start leads are connected to fuel pump power such that the fuel pump is shut off when the safety device is triggered.

In some embodiments, the safety device may be mounted on a plane parallel to the vehicle firewall in order to monitor vehicle roll and/or on a plane perpendicular to the firewall to monitor vehicle flip. In other embodiments, the safety device may be placed within the steering column, behind the brake pedal or clutch on the inside of the engine firewall. The CAL sensor (200) may include a plurality of LEDs (205, 207) and photodetectors (209, 211) to detect vehicle rollover based on the change in bank angle with respect to time. By computing the time taken for three consecutively increasing angle photodetections, a roll acceleration can be calculated. If the predicted roll acceleration exceeds the effects of gravity to prevent the roll, the vehicle will rollover.

In further embodiments, the safety device may comprise a dual in-line package (DIP) switch having a plurality of DIP switch positions (119-127). Each latching relay switch has two reset pins. In one aspect, connecting the first reset pin to the ground input causes the latching relay switch to switch to the second output position when power is applied to the set pin. In another aspect, connecting the second reset pin causes the relay switch to switch to the first output position when power is applied to the set pin. The DIP switch positions are connected to the two reset pins of the latching relay switches, and the final position of the DIP switch (119) bypasses the sensor, permitting a sensor trigger to be simulated during pre-installation testing. The DIP switches are nominally set such that the ground input is connected to the first reset pin and disconnected from the second reset pin. To reset the safety device, the DIP switch positions are reset so that the ground input is connected to the second reset pin of each relay switch. When the final DIP switch position is flipped, power is supplied to the latching relay switches, which causes them to switch to the original first output position. This causes the safety device to reset and the DIP switch positions to be reset to their original positions. As a result, the DIP switch permits all logic in the safety device to be tested.

Three Relay Embodiment

Referring now to FIG. 3, an alternate configuration of the vehicle rollover safety device disclosed herein. Said configuration is one embodiment for shutting off the ignition start and fuel pump using the CAL. Further, the alternate configuration eliminates the need for the relay connecting/disconnecting the electrical line to the starter of the vehicle. In FIG. 3, the alternate configuration of the vehicle safety device includes three relay latching switches (101), (102), and (103) of FIG. 1, and does not include the second relay latching switch (117) of FIG. 4.

FIG. 5 illustrates a mechanical implementation of an embodiment of the present invention. A sensor (510), such as the CAL sensor 200 of FIG. 2 and/or the elliptical arc sensor (900) of FIG. 9, is mounted on a printed circuit board (PCB) (512). The PCB (512) sits atop circuit board (514) which includes a relay circuitry or ignition control relays (517) and a photo optic circuitry (516). The photo optic circuitry of FIG. 10 A or FIG. 10 B may be one non-limiting example of the relay circuitry described with reference to FIGS. 1 and 3. More specifically, the Ignition control relays (517) detects vehicle rollover where, upon detection, the relay circuitry within the safety device shuts off power to the fuel pump, starter, and engine.

Wires (518) couple the components of the photo optic parts to the PCB 512 to external components. As described previously with reference to FIG. 5, light emitting elements (508) and photodetectors (506) interface through an exterior of the arcuate tube sensor.

Turning now to FIGS. 6A and 6B, schematic diagrams of example photo optic circuitries (1000) and (1050) that drive the photo optic components of the sensor (510) are shown. Specifically, the photo optic circuitries drive the light emitting elements and the photo detectors coupled to the sensor (510). Photo optic circuit (1000) includes a single dual-comparator 1006, resistors R1-R5, transistors Q1-Q2, photo diodes D2-D3. In another example embodiment, photo optic circuit 1050 includes two single comparators (1007), instead of a single dual-comparator (1006). As an example, the photo optic circuits (1000) and (1050) read the presence of antifreeze based on the voltage applied to the IR emitter. The voltage output of the photo transistor varies in an inverse square relationship to the IR emitter's input voltage.

Surround clamps may be used to accurately position flanged cylindrical electronic parts, such as, but not limited to: LEDs, IR emitters, Photo diodes and Photo transistors. When designing surround clamps with materials that flex, but return to their original shape when unused, it is best to size the clamp's inner diameter and top opening one measurable unit smaller than the minimum tolerance range of part's outer diameter. As 3D printer technology futures, it is more economical to manufacture and test these clamps for wall thickness acceptability than running through extensive material stress analysis calculations. In general, the thicker the clamp wall, the more force is required to insert and remove the part from the clamp. These clamps may include a flange slot or ring to insure the part remains positioned precisely within the clamp. The sensor (510) along with the relay circuitry (516) and the photo optic circuitry (516) are mounted inside a box (522) and sealed using flange lid (504) and insulator (520). The flange lid (504) is mounted to the box (522) with the aid of screws (502). The entire assembly with the sensor, light-emitting elements, photo detectors and the circuitries mounted inside the box may be referred to as a vehicle roll-over detection unit.

Additional Features

Referring now to FIG. 7, in some example embodiments, the unit may automatically reset following a roll over upon receiving an appropriate protocol from a hardwired cell phone interface. Additionally, or alternatively, the unit may include redundant sensors detecting the roll over condition, the CAL and an accelerometer. These sensors may be ANDED together for rollover realization. Additionally, or alternatively, the unit may deter auto theft by detecting a manual jump start attempt and report the attempt to both driver/police. Herein, two cell phones may be used, one permanently associated with the car, and another maintained by the driver. Additionally, or alternatively, the unit may be operated in a security mode wherein the unit may require the thief to hard wire repair the cut in the fuel pump line and jump start by passing the ignition system, all while the microprocessor (uP) may be detecting the theft attempt and reporting its progress to the driver/police. Additionally, or alternatively, the unit may stop an engine from being started if the temperature is below manufacturer's (or driver's) specified tolerance. Additionally, or alternatively, the unit may cause an “out of gas condition” if the engine temperature exceeds a learned maximum, thus reducing engine damage upon overheating. Additionally, or alternatively, each unit may maintain its own historical log which may be examined and used to further optimize the unit's future operation. Additionally, or alternatively, the unit may have a direct USB cell phone interface that may reduce the possibility of RF emission that could be captured and replayed for illegal car starting. All communication across this interface may be time/date stamp encrypted, so that signal tapping and replay over hard wire may not be possible. Additionally, or alternatively, the unit may issue automated assistance summons in the event of excessive tilt or attempted theft. Additionally, or alternatively, the unit may monitor its own temperature and log it for failure analysis. Additionally, or alternatively, the unit may monitor status of all relays at all times. Additionally, or alternatively, the unit may monitor status of its incoming powered connections and notify the driver if any of these connections become disconnected from power (once installed successfully).

In some example embodiments, the unit may be operated in one of the modes of operation listed below:

Mode 1—Normal operating mode—Ignition relays and fuel pump relays closed.

Mode 2—Security Mode—Ignition relays open and fuel pump relay closed.

Mode 3—Ultimate Security Mode—Ignition Relays and fuel pump relay open.

Mode 4—Over heated engine Mode—Ignition Relays closed, fuel pump relay open.

The following description details how the aforementioned features may be accomplished.

Input feed from microprocessor (alternately, “uP”) to Q1 transistor for startup and reset is continuously output from the uP to the Asynchronous Communication Interface Adaptor (“ACIA”) as Bit 6, and is zero normally (when neither startup nor reset are occurring). Its output will swing between 0 to 3.3 VDC. The 3.3 VDC output should be sufficient to trigger Q6.

There exist two initialization logic flows. The first is used for product installation, while the second is used whenever power is lost then restored. Product installation requires the use of a steering wheel mounted cell phone and custom application (“app”). The product first requests the installer's cell phone number. Using a cellular phone transceiver chip within the device, the steering wheel cell phone and device establish bi-directional encrypted communication. Text messages from the device will be both audibly sounded as well as logged for communication trail purposes. Each wiring hook up required will be software checked for accuracy prior to moving on. First hook up power and ground. Through software, confirm power and ground were connected successfully. Once the ignition switch relay interface has been checked, the relays will remain open to confirm the car will not start. Then through software, close the relays and confirm the car starts normally. If at any time the relays refuse to change to open or closed state, inform the operator the unit is faulty. If the unit is faulty, return the unit then restart installation with a new unit. Next, assuming the unit passed the last test, hook up the fuel pump leads, power on lead first. Once the leads are software examined as accurate, close the fuel pump relay and start the car. Through software, open the fuel pump relay. If the operator experienced an out of gas condition causing the engine to eventually stall, close the relay. Then insure the car starts normally. Next, hook-up the starter line tap to the unit, and confirm through software no power is present. Start the engine, while the starter is engaged, power should be briefly present on the starter line tap. If power was present momentarily, assume the starter line has been correctly connected. Next, connect the temperature gauge loop tap to the device input. If it lies between 1 and 0 assume it is connected correctly. This completes the product installation. Text the installer, informing him job well done, and log installation time/date to flash RAM. Configure relays to security mode and bring up driver login app.

The CAL sensor input line is fed into uP as the analog to digital convert (“ADC”) Line 11. DV/DT (The increase in voltage with respect to time is continuously monitored independent of temperature). Should this increase by 25% or more within 0.5 seconds, the bubble can be assumed to have reached a CAL end point. The sense a critical accident has occurred is 50%.

The accelerometer is also being simultaneously monitored for 85 degree shifts in vehicle orientation in the roll and flip directions. When the first 85 degree change in orientation is detected, the sense a critical accident has occurred is 50%.

Once the sense of a critical accident has occurred reaches 100% (i.e., both the CAL and accelerometer agree), universal asynchronous receiver transmitter (“UART”)=0, Bit 6=1 is output. Timer 1 begins its count down of 20 ms. Once Timer 1's time elapsed is just enough to trip the magnetic latching relays (approx. 20 ms), UART 0, Bit 6=0 is output and the fact that the sensor input has triggered the relays is recorded in flash memory to prevent all further sensing of initial accident criticality. Initial accident criticality is reported on every means of bus and cellular output available. Since there are now theft and critical accident output possibilities, a single wire output cannot be used.

uP controlled startup uses UART 0, Bits 0-5 as outputs to the bases of an 8-gate transistor array, replacing the DIP switches. UART 0, Bit 6 is used to pulse on/off transistor Q6 as needed to perform startup/reset operations for the ignition system relays. UART 0, Bit 7 is used to pulse on/off transistor Q7 as needed to perform startup/reset operations for the fuel pump relay.

Reset is performed by removing then re-applying power to the housings red/black leads (provided the sensor input has triggered the relays, once reset is complete this fact is erased). Simply disconnecting the vehicle +12 VDC battery will cause the device to reset.

The Accelerometer is placed on the relay PCB and is interfaced directly into the uP's ADC1, ADC2 and ADC3. Utilize basic Accelerometer to uP schematic and canned software interface routines. The photo optics sensors, utilizing photo diodes, and cherry red emitters, are ORed into one line and fed into an additional ADC, through a +12 VDC, GND, (plus other conductors) interface ribbon cable between PCBs.

I2C interface in both software and hardware. Serial bus interface in both software and hardware. Must record both high and low temperatures at equal priority, retaining these values in flash memory. Multiple processors: Utilize different resistor values to uniquely divide the voltage going into Multiplexer inputs 14 and 15 feeding ADC input. This way each processor will assume mastership in the order of greatest resistance used. The greater the resistance, the lower reading on the ADC. Using the ADC value as a countdown timer, the uP with the lowest timer countdown will boot first. Should communication cease from the primary for any reason, the next uP having the lowest ADC resistance will assume mastership. This way one can have as many potential master CPUs as necessary. By default, light an instrument panel warning light. Use the watch dog timer to insure the processor is operational. Once the processor becomes operational, extinguish the warning light. Should the processor ever cease functioning while the engine is running, re-light the warning light. Turn off the instrument panel warning light once the processor begins running normally. Power Line Monitored: Feed the +12VDC power line into ADC12. Use the Parallel Port 0, Bit 5 to control a transistor that switches on board battery power to the uP, multiplexer and cellular transceiver. Tap off the temperature gauge loop, feeding the tap into Multiplexer Line 0 into ADC.

Use the device to monitor the actual engine temperature and learn when it is outside temperature thresholds to operate. If the engine is too cold or too hot to operate, based on menu tolerances set by the vehicle manufacturer, vehicle owner or owner's mechanic, a battery disconnect/connect will be required to enable the device to avoid monitoring current engine temperature for one restart. On subsequent restarts, the device will return to using its saved preset temperature starting values for tolerance range to enable engine start. Voltage division must be used on the input of the ADC to insure +3.3 VDC max. Also, the output of ADC must be connected to ground through high impedance so the signal transmitting the temperature to the dash gauge will not be effected by the tap as it is not a good idea to shut off the engine on the pilot whenever it gets too hot, but just shutting off the fuel pump when it's too hot would simulate an out of gas situation. Preventing the engine from starting when it is too cold ensures the warranty conditions are up kept safely.

Use the device as a security ally. When the key turns off a normally running engine, open the ignition circuit and close the fuel pump circuit. When the ignition power is manually shorted, by a thief, to jump the engine, open the fuel pump circuit, log and notify a theft attempt to the police and driver, and initiate a one-day operational delay before the vehicle can be placed back in service to the owner. This is done because the starter line went high while the ignition relay was open. Once the one-day operational delay has lapsed, reconfigure the device back to normal engine off condition.

In the event that no theft attempt has occurred since turning the engine off, one way to permit engine start is to request, at shut off time, the expected time the vehicle needs to remain off, prior to being restarted. This random time, known only to the operator and car's uP, could be used by the uP to auto configure the ignition relays to closed, precisely when the appropriate time has elapsed. With the ignition relays closed and the fuel pump relay closed, the engine may be restarted. The only problem with this solution is that one can very rarely predict precisely how long they require the engine to remain off. This is due to unpredictable appointment length times, shopping times, etc.

What is needed is an authorization signal which will positively identify the driver's presence to the car, while providing the maximum amount of safety during the vehicle restarting circumstance. The perfect authorization signal with today's technology is the brake light loop. When the driver steps on the brake to start the car, the software configures the ignition relays closed, enabling the car to start normally. Odds are the thief jump starting the car will not press on the brake during the theft. If the brake loop authorization signal standard be figured out by thieves, each driver may customize this signal for his own security; using for example, the right turn signal lamp loop instead.

Ultimate security mode. Tap the starter line, convert input to 3.3 VDC range and feed into a parallel port input. Should the input go high after the car is already started for approximately 5 seconds, apply the security feature. If the operator attempts to restart the car once it is started, disable the engine from operating until the battery is disconnected then reconnected. This feature should only be used in the event of a hostile takeover attempt or whenever the driver wishes to safely leave the vehicle parked for a long period of time. In ultimate security mode, both the ignition switch relays and the fuel pump relay remain closed. The reason for engine disability must be logged so that it may be referenced to restart properly. Once restarted, the reason for engine disability is cleared. If the car is immediately restarted it makes the traditional starter grinding sound. Device engine disable forces a thief to both hot wire the ignition system and patch the break in the fuel pump line, prior to vehicle take over, all while the situation is being monitored by the uP.

Utilize the software to maintain logs from each device placed in a test environment. After the device(s) are returned, their logs may be analyzed to determine whether they performed properly.

Create a universal cradle to position a cell phone in the center of a steering wheel. The cradle will have a hook and loop fastening flap at the top to prevent the phone from falling out during steering wheel rotation. An app to inquire a driver's PIN code or SSN will be needed to identify the driver to the device prior to starting the vehicle. The ID will not be stored in the phone, but may reside permanently in uP memory (encrypted). The ID will not change with time. The cradle can attach with two nylon cable ties on the backside of the steering wheel spokes.

A cellular RF transceiver located in the device will be used to transmit/receive messages from the steering wheel cell phone. The device will transmit all it needs by using a +12 VDC auto battery. This should provide the device with more transmission power than the typical cellular phone. The device cell phone transceiver will only be used during product installation, owner license update and report of most severe situations. All transceiver communication will be time/date stamp encrypted to avoid RF capture and playback.

Tap off automatic door lock loop to determine when the vehicle first starts to travel. Technically an auto theft cannot be recognized until the vehicle is physically moved from one place to another without the driver's consent. When the door lock tap goes high, place the device in Mode 3, shutting off the fuel supply. Using a timer, turn on the fuel pump when you are sure the vehicle has stalled. When the timer elapses place the device in Mode 3. This way the thief cannot ohm out the fuel pump line to determine that the location of the break occurred within the device. Also, when the auto theft is detectable, cellular call 911 with location, license and owner information, then call the owner informing him not to approach the vehicle until informed its safe by police.

The device may be protected to prevent criminals from removing the device, reconfiguring the wiring to original condition prior to device installation, then successfully jumping the car. The device may detect whenever someone tries to remove it. The device may also generate the alert signal in response to police or other law enforcement agency using the bi-directional encrypted protocol to prevent criminals from operating a vehicle that is hijacked or stolen. For instance, a driver or owner can call 911 or transmit a panic alert to inform the police of vehicle hijacking or theft so that the police can generate the alert signal to shut-off the engine when the driver or owner cannot.

All wire taps required will only need 24 gage wire wrap wire input to the device. The CAL will be held down and accurately positioned on the PCB using three 24-gage wire wrap wire tie downs.

When employed with a microprocessor (alternately, “uP”), one embodiment of the device comprises the following microprocessor input/outputs:

1) Serial communication line between uP and cell phone USB port (UARTO, 19.2 KB). Encrypted bi-directional protocol to obtain engine startability in secure state. Encrypted bi-directional protocol to summon towing assistance, police assistance, rescue assistance, fire department assistance, etc. Based on reason for changing engine's operational status. Encrypted bi-directional protocol to toggle on/off transmission of cars GPS location.

2) Serial communication line between upper PCB and bottom PCB ACIA (UART1, 19.2 KB). Serial line bits: Bits 0,1: output to lower PCB transistor array to configure open/closed position of ignition relay 1; Bits 2,3: output to lower PCB transistor array to configure open/closed position of ignition relay 2; Bits 4,5: output to lower PCB transistor array to configure open/closed position of fuel pump relay; Bit 6: output to lower PCB Q1 transistor used to apply power for configuration of ignition relays; Bit 7: output to lower PCB Q2 transistor used to apply power for configuration of fuel pump relay.

3) Vehicle temperature sensor inputs, to upper PCB, for line tap to ADC multiplexed line 0.

4) Vehicle starter line inputs, to upper PCB, for tapped input to Multiplexed ADC line 1.

5) Accelerometer line inputs, on upper PCB, to Multiplexed ADC lines 2, 3 and 4.

6) Parallel Port 0, Bits 0-3. Used to address multiplexer for input to ADC.

7) Interface cable between upper and lower PCBs of 9 Conductors: +12 VDC, GND and UART1 Xmit line, relay output leg status lines feeding as input to Multiplexer ADC lines 5, 6 and 7, and relay input leg status lines feeding as input to Multiplexer ADC lines 8, 9 and 10. If all multiplexer inputs are 0-+12 VDC, a single voltage divider can be applied to the multiplexer output.

8) Parallel Port 0, Bit 4. Used in combination with inverter, to turn on/off the uP status dashboard lamp based on uP's watch dog timer.

9) Auto battery input power line, for Multiplexer ADC line 12. Parallel Port 0, Bit 5. Status of auto power, 0=off, 1=+12 VDC.

10) CAL line input, on upper PCB, for Multiplexer ADC line 11.

11) Automatic door lock loop tap, on upper PCB, for Multiplexer ADC line 12.

12) Authorization to start: Brake line loop, on upper PCB for Multiplexer ADC line 13.

13) Multiple processor ADC feeds. Multiplexer input lines 14 and 15 are connected to unique resistive loads so that each microprocessor boots in order.

14) Parallel Port 0, Bit 5. Used as output of a jump start condition detected. 0—No jump start detected, 1—Jump start detected.

15) Parallel Port 0, Bit 6. Used to output condition of a critical accident. 0—No critical accident occurrence, 1—Critical Accident has occurred (only resettable by disconnecting/connecting +12VDC power).

Auto-Theft Proof Design

Objectives of the auto-theft proof design: discern between a normal engine start and a thief's jump start; in the event of a jump start, disable the vehicle the instant it moves; lock thieves inside for up to a day maximum; and means by which vehicle is disabled must be temporary, so that it cannot be traced and bypassed in the future.

CAL Sensor Applications

Additional and non-limiting applications of the CAL sensor include the following: Vehicle curve banking and forward incline/decline; Artificial equilibrium; Robotic equilibrium, Aircraft glidescope and dive/climb; Ship pitch and yaw; Gravitational field descent landing optimizer; Gravitational field detector; Tilt measurement tool (relative to gravitational field norm for building construction and process control; Adjustable tilt control; Gravitational guidance technology for cruise missiles (full circle CAL sensor) and rockets; Photographic orientation; Valuable artifact movement sensor (flattened arc, narrow bubble, peak point, monitored bi-directionality); Museum curios; Weapons in storage; and Fuel storage cask movement.

As used herein, the term “about” refers to plus or minus 10% of the referenced number.

Various modifications of the invention, in addition to those described herein, will be apparent to those skilled in the art from the foregoing description. Such modifications are also intended to fall within the scope of the appended claims. Each reference cited in the present application is incorporated herein by reference in its entirety.

Although there has been shown and described the preferred embodiment of the present invention, it will be readily apparent to those skilled in the art that modifications may be made thereto which do not exceed the scope of the appended claims. Therefore, the scope of the invention is only to be limited by the following claims. Reference numbers recited in the below claims are solely for ease of examination of this patent application, and are exemplary, and are not intended in any way to limit the scope of the claims to the particular features having the corresponding reference numbers in the drawings. In some embodiments, the figures presented in this patent application are drawn to scale, including the angles, ratios of dimensions, etc. In some embodiments, the figures are representative only and the claims are not limited by the dimensions of the figures. In some embodiments, descriptions of the inventions described herein using the phrase “comprising” includes embodiments that could be described as “consisting of”, and as such the written description requirement for claiming one or more embodiments of the present invention using the phrase “consisting of” is met. 

What is claimed is:
 1. A vehicle safety device, comprising: a tilt sensor that generates an alert signal in response to vehicle tilt; and a bistable switch circuit that toggles between a first bistable switch position and a second bistable switch position to: selectively connect a power source to an ignition system and a fuel pump in the first bistable switch position in response to a reset signal; and selectively disconnect the power source from the ignition system and the fuel pump and generate a notification signal in the second bistable switch position in response to the alert signal to shut off the engine and summon emergency assistance at a remote location. 